Not so simple. the problem that this ftp user exists in FTP Manager 2 and password is correct. I am sure something wrong with pureftp because, the normal users that have been added by User Accounts - > Add Account working without any troubles. But If I am adding additional ftp user through the File Management - > FTP Manager 2 I am getting troubles like that.I am under CentOs 6.1

This user have the same identical id as shell user.But you must login with a '@' and with domain associated (p.ex.: user@domain.com)

If you still can not login, check if this user exists in '/etc/pure-ftpd/pureftpd.passwd' file, and if its home directory really exists, and if the file was created at the exact same datetime that the file '/etc/pure-ftpd/pureftpd.pdb'.